Power adapter housing assembly, power adapter, air conditioner and dehumidifier

The utility model discloses a power adapter housing assembly, a power adapter, an air conditioner and a dehumidifier. An accommodating space for mounting a control plate is formed in the housing assembly. The housing assembly comprises an outer housing and an inner housing arranged in the outer housing. The outer housing is provided with an outer air inlet and an outer air outlet, and the inner housing is provided with an inner air inlet and an inner air outlet. The inner air inlet and the outer air inlet are mutually staggered and are communicated with each other via an air inlet passage formed between the outer housing and the inner housing. The inner air outlet and the outer air outlet are mutually staggered and are communicated with each other via an air outlet passage formed between the outer housing and the inner housing. The airflow passages formed inside the housing assembly facilitate the ventilation and the heat dissipation of the power adapter. Meanwhile, the housing assembly is provided with two layers of housings, namely the outer housing and the inner housing, and the air inlets and the air outlets on the inner and outer housings are mutually staggered. Thus, the waterproof effect is realized.